Requested by PRINCESS_SHUI_HYUNG
Tysm for your request. I hope you'll like the requested story...
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If I told you all that Lui Shirosagi, one of the Supreme four bladers, had a soft and caring spot, would you all believe me? I'm guessing not. Well, let me tell you about (Y/N) Shirosagi. She's the twin sister of Lui.

But she looked very different from him. The similar thing Lui and (Y/N) had was both of their hair would go up whenever they would be in an intense beybattle.

Talk about dissimilar things, well the siblings had quite a many. (Y/N) was friendly, polite and respectful while Lui was not. Lui was arrogant and impulsive while (Y/N) was not. But still, they loved each other.

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No one's P.O.V. Inside Lui's private island training facility:-

"Please Lui, please please please!" (Y/N) pleaded her brother with puppy dog eyes.

"Please let me see your battles!"

"Tch..." Lui grumbled at his sister's constant pleas to let her come with him to see his battles. (Y/N) held his hand and continued,

"Please, please, please, please..."

"Alright, fine! Just stop with the pleading! It's getting annoying!" Lui sighed in defeat.

"Yay! You're the best big brother!" (Y/N) exclaimed happily as she hugged him tightly.

"Yeah, yeah. I can't see my little sister sad." Lui rolled his eyes as he patted his childish sister.

"Now, come on. There's this new rookie who wants to battle me."

He said as he slowly pulled away from the hug and took out his phone. He showed (Y/N) a picture of a guy with purple spiky hair.

"Who is this, onee-chan?" She asked.

"This guy is...what was his name again? Oh yeah, he's Lane Wallhala. I heard he has defeated Free so I thought he might be worthy of battling me." He explained.

"I think he kinda looks like you."

Lui grumbled as he asked, "And what gives you that idea, huh? How does he look like me?"

"His hair are similar like yours and...he looks like an arrogant one just like you are." (Y/N) giggled as she pointed out and Lui just made an annoyed 'tch' sound.

"Whatever. Now come on, if you want to watch the battles, blueberry." Lui sighed as he put his phone back.

"Okay!"

The girl smiled excitedly as she grabbed Lui by the arm and dragged him outside to where he was supposed to have his battle.

"Jeez. Stop dragging me, (Y/N)." He managed to say as he got dragged away.

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No one's P.O.V. Outside in a cloudy weather. At Lui's island:-

"(Y/N) stop before we fall." Lui scolded as they reached outside and (Y/N) stopped much to his relief.

"I'm so excited, Lui! I always have to watch your battles on TV. But now I can see you battle in reality!" She smiled.

"You're talking as if you're a fan of me, (Y/N)." Lui said as he patted his sister's head.

"Not a fan. But a person who looks up to you. And you better not lose this battle." (Y/N) responded, enjoying his head pats.

"I'm not the type of guy to lose to a rookie. Don't worry." He reassured and continued,

"Now, you can go and sit in the sidelines, alright? Standing and watching would be uncomfortable."

"Okay. All the best onee-chan!"
The female exclaimed as she ran off to the sidelines.

Lui sighed as a small smile made its way up to his face. "....she'll never grow up, will she?..." He mumbled.

In the sidelines:
No one's P.O.V.

"Now where should I sit?"

(Y/N) wondered as she looked for the right spot to sit on. As she was walking, she noticed a white haired male sitting on the upper steps. Now being the friendly girl she was, she decided to go and sit beside him.

So, she went upstairs and quietly sat beside the albino who seemed to be lost in his own thoughts, to the point that he didn't notice the girl's presence beside him.

"Hello!"
She called out cheerfully, snapping the male out of his thoughts. He looked beside him and was a little surprised.

"Hi." He replied in a monotone voice.

"You're Shu Kurenai, right?" She asked.

Shu mentally prayed for her not to be one of his fangirls. So, hesitantly he answered,

"Yeah, I am."

"Cool! Nice to meet you!" The female exclaimed happily and held out her hand for him to shake.

"Nice to meet you too. Um-" Shu shook the girl's hand as she realised that she didn't introduce herself.

"Oh, my bad. I'm (Y/N) Shirosagi." She smiled cheerfully.

"I see. So, you're a relative of Lui Shirosagi?" The albino asked raising an eyebrow as the girl nodded.

"I'm his younger sister. He's older only by a year, though." She said.

"Oh. I see."

Shu nodded in understanding, before turning his head and examining her features. Looking carefully, he figured she didn't look much like her brother.

"You are quite different from him, though." The male said out loud, making the girl chuckle.

"I know. Everyone who meets me, says that at first." She smiled.

"I see."

Shu nodded in understanding as he turned his head back at the battle when he heard the match was starting. (Y/N) did the same as well.

The duo watched as the battle got intense and Lane's flare showed up. Lui's hair went up in flames as he intensely focused on the battle. (Y/N) knitted her brows together as she stood up and shouted,

"COME ON BIG BROTHER! YOU CAN DO THIS!"

Shu who was sitting next to her, got startled by the sudden raise in voice of the girl. But then, he smiled as he thought,
'She really loves her brother so much.'

Lui who was at the stadium heard her voice and thought, 'I can't lose this battle. I made a promise to (Y/N).'

"LUINOR! RAGING UPPER!" He yelled as Luinor did what it was told.

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Post battle:-

Everyone's eyes widened at the result of the battle. Lane had burst Lui's bey, in a swift.
"You're also not worthy enough to take on my flare." Lane scoffed as he turned to walk away.

(Y/N) gritted her teeth as she ran to the stadium and was about to charge at Lane until Lui had to hold her back.

"How dare you say my brother isn't worthy? He's one of the strongest bladers out there. He'll never lose to a rookie like you!" (Y/N) screeched angrily.

"Calm down, (Y/N)." Lui tried to calm his sister down as she wasn't the easiest person to hold for long.

"But Lui-" She began but Lui cut her off as he said, "Don't worry. I was just testing how capable he actually is. Next time, Luinor won't let him off."

And he gave her, his classical insane face. That calmed the (h/c) haired girl down as Lui released her and walked back into the facility.

Meanwhile, a certain albino had quietly made his way up to the girl after Lui walked away.

"(Y/N)." He called out. The female turned her head to the direction of the voice, only to see the crimson eyed boy, who was sitting next to her in the sidelines.

"Hey, Shu." She smiled and walked up to him. "What are you doing here? I thought you went away with your student."

"I needed to tell you something." He said as a very light red crept on his face.

"What is it?" The girl tilted her head curiously.

"Well, the first thing is I'm sorry about how Lane treated your brother and the second is..." His voice trailed off as the girl asked,
"The second is? Tell me, tell me please."

"I like you. So, will you please be my girlfriend?"

He asked as he finally managed to make eye contact with the girl. (Y/N) took a minute to process what he just said and then just simply stood there, dumbfounded.

Shu got worried that she might reject him so he quickly began, "I-it's- alright if-"

He got cut off as the female tackled him with a tight yet warm hug. He managed to keep himself and (Y/N) balanced and hear a soft "Yes." from his shoulder.

Shu smiled as he kissed her head and (Y/N) moved to look up at him with a cute face.
"But we'll take things slow, okay?" She spoke softly as Shu nodded and replied,

"Sure. I don't want to rush as well."

Before they could enjoy each other's warmth a little more, they heard footsteps walking towards them as Lui yelled,

"KURENAI! WHY THE HELL ARE YOU HUGGING MY CUTE LITTLE SISTER?!"

Shu chuckled as he replied,
"Well, she's not just your sister anymore. She's my girlfriend as well."

"What?!" Lui's jaw dropped.

(Y/N) looked at her brother with puppy dog eyes as she pleaded,

"Please, onee chan...I really like him."

Lui sighed as he walked closer to the couple and ruffled his sister's hair, before replying,

"Alright. If you like him so much, then I approve." Then turning to Shu, he lightly glared at him as he warned,

"Kurenai, you better be good with her. If she ever comes crying to me because of you, then I WILL make you wish you were never born. Understood?"

Shu only nodded as he smiled at (Y/N) again. Lui made a 'tch' sound as he said before walking back inside his training facility, "I'm serious."

After the blue haired blader was gone, Shu and (Y/N) exchanged numbers, before Shu too turned to leave.

"I'll see you around, (n/n)." Shu smiled as he pecked (Y/N)'s cheek.

"Same. Don't forget to call me, once you're back at the Bulls!" She smiled as she did the same action of love to Shu.

Shu nodded as he walked away. After he was gone, (Y/N) walked back to her brother.

'Lui is the best big brother and Shu's the best boyfriend.' She thought and smiled.
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Done. How was it? Did you like it? I'm sorry if you didn't. I'm also sorry for my terrible grammar or if this one shot was cringe. 😞
Anyways vote, comment, share and maybe....follow me too? All the characters belong to Hiro Morita, only the story plot is mine.
Stay safe and have a nice day/noon/evening/night.
Sayonara, bug out.